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对灰度图像的某一区域进行均值滤波，mask要什么图像，要的灰白还是RGB的bmp图像，图像要放在哪里，mask怎么加载这个图像，就是怎么使用 QQVGA（160x120）对区域roi：(0,60,160,30)均值滤波
直接运行
https://book.openmv.cc/example/04-Image-Filters/mean-filter.html